Índice
What is fuel consumption and why does it matter?
Fuel consumption refers to the amount of petrol or diesel your vehicle uses to cover a given distance, typically expressed in litres per 100 kilometres (L/100 km).
This figure matters for several reasons:
- Spending control: Knowing how much fuel your car consumes allows you to calculate what you're spending on petrol or diesel — essential for managing your budget, especially when prices are volatile.
- Vehicle comparison: Fuel consumption is a key factor when comparing different car models. A more efficient vehicle will save you money in the long run.
- Environmental awareness: Lower fuel consumption means fewer greenhouse gas emissions, helping to protect the environment.
Formulas for calculating fuel consumption
There are several ways to calculate your car's fuel consumption. Here are two straightforward formulas:
Basic calculation: litres per 100 km
This is the most common way to express fuel consumption. Use the following formula:
Formula: Consumption = (litres used ÷ km travelled) × 100
Example: If your car has used 40 litres of petrol to cover 500 km, the calculation would be:
Consumption = (40 litres ÷ 500 km) × 100 = 8 L/100 km
Cost per kilometre
This formula tells you how much it costs to drive one kilometre in your car.
Formula: Cost per km = litres used × price per litre ÷ km travelled
Example: Using the figures above, if the price of petrol is €1.80 per litre, the calculation would be:
Cost per km = 40 litres × €1.80 ÷ 500 km = €0.144/km
A practical step-by-step example
Here's how to calculate your car's consumption in practice:
- Step 1 – Fill up: Next time you fill up at a Moeve Service Station, note down the number of litres you've added. It's also a good moment to check your tyre pressure — a simple habit that makes a real difference to your consumption.
- Step 2 – Reset the trip counter: Before setting off, reset your partial odometer to zero.
- Step 3 – Drive normally: Go about your usual driving routine, avoiding harsh acceleration or unnecessary braking.
- Step 4 – Fill up again: When the tank is nearly empty, fill it up again and note how many litres you've added.
- Step 5 – Record the distance: Note down how many kilometres you've covered since you reset the trip counter.
- Step 6 – Apply the formula: Using the data you've gathered, calculate your consumption: Consumption = (litres used ÷ km travelled) × 100
How to calculate fuel for a road trip
Planning ahead for a journey? Follow these steps to work out how much fuel you'll need:
- 1. Work out the distance: Check a map or navigation app to find the total distance of your route.
- 2. Know your average consumption: Use the figure you calculated earlier, or refer to your vehicle's technical specifications.
- 3. Do the maths: With the distance and average consumption to hand, a simple calculation will give you the litres you'll need.
Example: Say you're planning a 400 km trip and your car averages 7 L/100 km.
- If it uses 7 litres every 100 km, then over 400 km it will use X litres.
- X = (400 km × 7 litres) ÷ 100 km = 28 litres
In this case, you'd need around 28 litres for the journey. Remember, you can find the best route and locate Moeve Service Stations along the way using the Moeve gow app.
Return journey: For a round trip, simply multiply the one-way fuel estimate by two.
Factors that affect fuel consumption
A car's fuel consumption can vary depending on a number of factors:
- Driving style: Harsh acceleration, unnecessary braking and driving at high speeds all increase fuel use.
- Type of road: Stop-start city driving consumes more fuel than cruising at a steady speed on an open road.
- Vehicle load: The heavier the load your car is carrying, the more fuel it will use.
- Vehicle condition: Proper maintenance — including correct tyre pressure and clean filters — helps keep consumption down. You can have your vehicle serviced at our Órbita workshops and benefit from the expertise of our professionals.
- Weather conditions: Extreme cold or heat, and rainy conditions, can affect engine performance and push up fuel consumption.
- Lubricants: Using quality lubricants in good condition reduces engine friction, enabling more efficient operation and lower fuel use. Changing your oil regularly and choosing the right type for your vehicle helps optimise performance and save fuel. Discover Moeve's range of lubricants designed to help you do just that.
Knowing how much fuel you use — and understanding the factors behind it — puts you in control of your spending, helps you make smarter choices when comparing vehicles, and makes you more mindful of your environmental impact. With the formulas and tips in this post, you have everything you need to calculate your consumption simply and accurately.